The district duchy, also known as the district principality, was a type of the state under the patrimonial system, such as duchy or principality, formed in the feudal system, as a result of land partition between the members of a royal family.
[1] It occurred in the Middle Ages and early modern period, notably in Europe, in states such as the Holy Roman Empire,[2] Duchy of Poland,[1][3] and Kievan Rus'.
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